Dale Earnhardt Jr. on Friday urged a Republican who backed an amendment to end military sponsorship of sports to do his “homework” on NASCAR’s influence by attending a race.

The popular NASCAR driver, who is sponsored by the National Guard, singled out Rep. Jack Kingston (R-Ga.) for his sponsorship of an amendment to a defense bill that would prohibit the military from using federal funds to sponsor professional sports teams.

“I think the Republican from Georgia that is heading the bill hasn’t even been to a NASCAR race,” Earnhardt said during a media event at the Charlotte Motor Speedway, according to multiple reports.

Earnhardt suggested attending a race might change Kingston’s mind.

“Just because he’s a Republican from Georgia, he ought to have been to a NASCAR race by now,” he said.